话不多说，先上效果图
受制于网站的容量，最多只能上传4MB的动图，所以我调快了动画的速度，缩短了动图的工夫，实际上动画是很弛缓的。
说到动画，家喻户晓，突变是不可能应用通过keyframes实现动画过渡成果的，只会忽然的扭转色彩。
例如，如果关键帧代码如下
@keyframes test { 0%{ background: linear-gradient(60deg, rgba(84,58,183,1) 0%, rgba(0,172,193,1) 100%); } 100%{ background: linear-gradient(60deg, rgb(173, 162, 218) 0%, rgb(201, 14, 189) 100%); }}能够看到背景色并不会平滑的过渡，只会十分生硬忽然的色彩变动，显然不是咱们想要的成果。
换个想法，没必要局限于在keyframes中应用linear-gradient来实现突变动画成果，linear-gradient不可能平滑过渡，然而position能够呀，所以咱们先实现这样的成果
html代码如下
<div class="header"> <div class="inner-header flex"> <svg version="1.1" class="logo" baseProfile="tiny" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 500 500" xml:space="preserve"> <path fill="#FFFFFF" stroke="#000000" stroke-width="10" stroke-miterlimit="10" d="M57,283" /> <g> <path fill="#fff" d="M250.4,0.8C112.7,0.8,1,112.4,1,250.2c0,137.7,111.7,249.4,249.4,249.4c137.7,0,249.4-111.7,249.4-249.4 C499.8,112.4,388.1,0.8,250.4,0.8z M383.8,326.3c-62,0-101.4-14.1-117.6-46.3c-17.1-34.1-2.3-75.4,13.2-104.1 c-22.4,3-38.4,9.2-47.8,18.3c-11.2,10.9-13.6,26.7-16.3,45c-3.1,20.8-6.6,44.4-25.3,62.4c-19.8,19.1-51.6,26.9-100.2,24.6l1.8-39.7 c35.9,1.6,59.7-2.9,70.8-13.6c8.9-8.6,11.1-22.9,13.5-39.6c6.3-42,14.8-99.4,141.4-99.4h41L333,166c-12.6,16-45.4,68.2-31.2,96.2 c9.2,18.3,41.5,25.6,91.2,24.2l1.1,39.8C390.5,326.2,387.1,326.3,383.8,326.3z" /> </g> </svg> </div> <div> <svg class="waves" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 24 150 28" preserveAspectRatio="none" shape-rendering="auto"> <defs> <path id="gentle-wave" d="M-160 44c30 0 58-18 88-18s 58 18 88 18 58-18 88-18 58 18 88 18 v44h-352z" /> </defs> <g class="parallax"> <use xlink:href="#gentle-wave" x="48" y="0" fill="rgba(255,255,255,0.7" /> <use xlink:href="#gentle-wave" x="48" y="3" fill="rgba(255,255,255,0.5)" /> <use xlink:href="#gentle-wave" x="48" y="5" fill="rgba(255,255,255,0.3)" /> <use xlink:href="#gentle-wave" x="48" y="7" fill="#fff" /> </g> </svg> </div></div>css代码如下
body { margin:0;}h1 { font-family: 'Lato', sans-serif; font-weight:300; letter-spacing: 2px; font-size:48px; user-select: none;}p { font-family: 'Lato', sans-serif; letter-spacing: 1px; font-size:14px; color: #333333;}.header {position: relative; text-align: center; background: linear-gradient(45deg, rgb(84 58 181), rgb(84 58 181 / 70%), rgb(0 172 193 / 70%), rgb(87 228 246),rgb(255 255 255)); color: white; box-shadow: 1px 1px 6px #00000087;}.logo { width:50px; fill:white; padding-right:15px; display:inline-block; vertical-align: middle;}.inner-header { height:65vh; width:100%; margin: 0; padding: 0;}.flex { /*Flexbox for containers*/ display: flex; justify-content: center; align-items: center; text-align: center;}.waves { position:relative; width: 100%; height:15vh; margin-bottom:-7px; /*Fix for safari gap*/ min-height:100px; max-height:150px;}.content { position:relative; height:20vh; text-align:center; background-color: white;}/* Animation */.parallax > use { animation: move-forever 25s cubic-bezier(.55,.5,.45,.5) infinite;}.parallax > use:nth-child(1) { animation-delay: -2s; animation-duration: 7s;}.parallax > use:nth-child(2) { animation-delay: -3s; animation-duration: 10s;}.parallax > use:nth-child(3) { animation-delay: -4s; animation-duration: 13s;}.parallax > use:nth-child(4) { animation-delay: -5s; animation-duration: 20s;}@keyframes move-forever { 0% { transform: translate3d(-90px,0,0); } 100% { transform: translate3d(85px,0,0); }}/*Shrinking for mobile*/@media (max-width: 768px) { .waves { height:40px; min-height:40px; } .content { height:30vh; } h1 { font-size:24px; }}再而后，咱们把背景放大，也就是在.header中加上这一行代码background-size: 400%
而后写一个背景挪动的关键帧动画
@keyframes gradient { 0% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } 100% { background-position: 0% 50%; }}利用到.head中
.header {position: relative; text-align: center; background: linear-gradient(45deg, rgb(84 58 181), rgb(84 58 181 / 70%), rgb(0 172 193 / 70%), rgb(87 228 246),rgb(255 255 255)); background-size: 400%; color: white; box-shadow: 1px 1px 6px #00000087; animation: gradient 5s linear infinite;}调整动画速度只有批改animation中的5s就行了，轻易改成什么数字就行。
底部的突变波纹动画来自于该网站
https://codepen.io/goodkatz/p...